Motor-controller.



A. J. HORTON.

MOTOR CONTROLLER APPLICATION FILED JULY e, 1908.

Was/e5? A. J. HORTON.

MOTGR CONTROLLER.

APPLICATION nun JULYG, 1908.

1,108,907. Patented Sept. 1, 1914.

2 SHEETS-611E111 2.

UNITED srArEs PATFil OFFICE.

Amannri LI. Henson, or W113: HAMMnenre. 00., or M1512 'EL'AINS, new YGRK, essiencn ro min "curr ng,

WISCONSIN, A. oonronarion or W sconsin.

tro'ron-oonrnotnnn.

integer.

clear, concise, and exact description, reten once-being had to the accompanying draw- 111g, forming apart oi-tlns SPQClfiCAtlOIL My invention relates to improvements in.

speed controllers and has, for its object to provide an automatically operated controller Which-is capable of being adjusted to' oring,

the motor up to any predetermined inanimum speed.

Mypresent nventionrelates to one of the? several modifications or embodiments of which the generic invention set forth in in prior application filedMay 4, 1908, Serial No. 430,829, is susceptible. 7

According to the preferred form oi my present invention, I-provide an adgustable connection between the movable element of I I v a the controlling device and the plunger or the operating winding.

For the purpose of more tullydisclosing my invention I have shown, in accom' panying drawings,'the preferred IOFlDlZllQIQ- of embodied inla combined starting and speed controlling device. It should he in derstood that various modifications may he, made in the form of device illustrated, and.

that-the same may be used in other relations.

The views in the drawings are es follows: Figure-11s a front elevation or the device,

parts of aspeed controller being SllOWIl in section. Fig. 2 diagrammatically illustrates'one eireuitierrangement for the device. k

The various parts of the controller are preferably :znount'ed on a supporting panel 1. An arin 3, i'ulcruined on a 2, protruding IflOD1'l/l18 :ptl1(5l, is provided with brushes 1 and 8. The brush Z is adapted to he moved over a of contacts 9, While the brush 8 is adap'tedto engage either contact segment-l0 or contact 11, according to the position ofthe arm. A coil soring l,

connected at one end to the-arm tl'and at its other eiid to pin .5, carried the panel 1, tendsjomove said arm to the left against a stop "iii, The arm 8 is provided rith an operating; handle 12. A stop 15 is provided to limit the inoyenient'oi -the ar 1 1 l t right. A hook 14; is to e W A e Specification of Eaters yaterit.

ratemezi sept. 15191 pin 16, carried by the arm 3, tornaintain said arm inits final position. The hook 14 is :l iilcruined on a pin 17, carried by the panel-l, and is provided with a coil spring lS'WhiCh tends-to move the same upwardly. The upward movement of the hook 14; is liniitedhy the stop 13. The hook 14: is so formed that as the arm 3 reaches its final position the pin" 16 will ride over the end thereof to automatically lock said arm. As willhehereinafterexplained,the arm 3 is ivhich 'emhodiesmy invention in one form:

This device comprises a switch or arm 20, fulorun ed on a. pin 21, and adapted to sweep over a series of contacts 22. The'arm 20 is provided with an operating solenoid 23, mounted in a; 'rame'24 secured to1the panel 1. Thesol ez ioi d 23 isprpvided with a plungel 25-v hi.chcarries;a tail rod 26. The arm 20 carries 2 7 which fits in a transverse slot'in' the-tail rod 26. The lower endof the tail rodis connected to the piston 28 of a dash-pot Q9. The dash-pot 'may beof any desired type. The lowerend of the plunger 25 is preferably made hollow and internally screyv-threaded-to receive the screwthreaded POLJlOR 30 of the tail rod 26. At its lower e nd the plunger 25 is'provided with a knurled collar 31 v by means of which it may he turned onfithe tail rod 'to raise or lower the same, in the Winding 23. The purpose of this adjustment Will be hereinafter explained; For preventing theplunger 25 from. turningjon the tail "rod after adjust ment, 'I provide a 'lock nut 32. The solenold 23 is provided With'a stationary core or recessed to receive the conical end of the plunger 25. Entending'through the plug 33 and projecting into the recess in the end thereof, is pin provided with 2 head 35 which bears upon the end of the plug. Mounted directly above the solcnoidin the path of the pin is a switch 36. The switch 36 preferably comprises a strip of spring metal secured at one end to a pin 37 carried by the panell, and adopted at its other end to engage a contact With this arrangement it will be seen that the plug 38 forms a stop for the plunger 25 and that the plunger 25 reaches the limit of is upward movement it Will raise the pin 34 l I A w v adapted to he cperatedto control a starting line 44:.

40, through switch 42, to main line 43. The

the arm 20 to the first of the series of convtacts 22, thence by conductor 49 through the and cause the same to open the switch 36. As shown in the drawing, the plunger 25 is adjusted to its lowermost position on the tail. rod 26 and therefore the upper end of said plunger is at the greatest distance from the plug 33 allowed by the adjustment. With this adjustment the full upward movement of the plug 25 will raise the arm 20 into engagement with the uppermost of the series of contacts 22. As will be hereinafter explained, the contacts 22 are connected to a field regulatingresistance, so that as the arm 20 moves upwardly it will gradually insert the resistance in circuit with the shunt field winding of the motor, thereby gradually increasing the speed of the motor. 2

I shall now describe the circuit arrangement for this device: @ne terminal of the motor armature a is connected by conductor other terminal of the armature is connected. by conduct-or 4-5 to the last of the series of moaeo? the main line 48. The motor is thus started with all of the starting resistance in circuit. It now the arm 3 be moved tothe rightit will gradually remove the resistance. ad-from circuit and when moved to its extreme righthand position. will bring the motor upto normal. speed. W hen the arm 3 reaches its final position the hook 1st will engage the pin 16 and lock said arm. Inasmuch as thespring 4. tends to move the arm 3 to its oh position it will be seen that said arm must be moved to its final position before being released, as otherwise the same would return to the starting position and openthe armature circuit. When the arm 3 reaches its final position the brush 8 is moved onto contact 11, which results in the closure of the circuit of solenoid winding 23. This Qig'cuit may be traced, as already described, to l'rrm 3, thence to contact 11, by conductor 55, across switch 36 to contact 38, by-conductor 53, through the solenoid and by conductors 52 and 40 to the main line 453, The

contacts 9. All except the first of the series solenoid will then respond and raise its of contacts are connected to an armature resistance 46. The arm 3 is connected by conductor 47 through the switch 42 to main I One terminal of the shunt field winding f of the motor is connected by conductor 48 to conductor 40, while the other terminal of said winding-is connected by conductor 49 to the lowermost of the series of contacts 22. The contacts 22 are connected to a field resistance 50. The arm 20 is connected by conductor 51 to conductor 47. One terminal of the solenoid 23 is con nected by conductor 52 to conductor 40, while the other terminal. thereof is connected by conductor 53 to contact 38. Contact 38 is connected by a resistance 54 to pin 37, which is connected by conductor 55 to contact 11. The first of the series of contacts 9 and the contact segment 10 are both dead.

I shall now describe the operation of the device: Assuming that the main line switch 42 is closed and the arm 3 is in its oil position, as shown in dotted lines, Fig. 2, the armature circuit will be open while the field circuit is closed. The field circuit 'Inay be traced from main line 14:, through switch 42 by conductors 47 and 51, through field winding f, by conductor 4-8 to conductor 40, thence through the switch 42 to main line It will thus be seen that the shunt field winding is of full strength. If new arm 3 be'moved onto the second of the series of contacts 9, circuit will be closed through the motor armature. This circuit may be traced from main line 441-, through switch 42, by conductor 47, through the arm 3, through the resistance 46 by conductor 45, through the motor armature, and thence by conductor 40 through the switch as to plunger 25. The upward movement of the .plunger 25 causes the arm 20 to move over the contacts 22 and inserts the resistance 22 in circuit with the shunt field winding f. This causes the motor speed to gradually increase until the plunger 25 is stopped by the stationary plug 33. As already set forth, the parts are shown to be so adjusted that when the winding 23 is energized, the

arm 20 will be moved over "all of the con- 7 facts 22, and, therefore, when the plunger 25 is stopped by the plug 83 the motor will be caused to operate at the maximum speed provided by the field resistance. When the plunger 25 reaches its final position, it raises the pin 34. which in turn opens the switch 36, thereby inserting the JTQSlStEIDCQ 54. in circuit with the solenoid. winding. fifhe insertion of the resistance 5% preveni fthe solenoid winding from becoming overheated.

The purpose of the adjustment between the plunger 25 and the tail rod 26 will now be apparent, for, if the plunger is raised on the tail rod the same will be raised in the Winding 23, thereby decreasing the distance between the end of the plunger and the stationary plug 33. Ifthe distance between the plunger and the plug is decreased it is obvious that the range of movement of the plunger is decreased, and, therefore, the range of movement of the arm 20 is decreased. Suppose, for instance, the plunger 25 to be so adjusted on the tail rod that thtz1 distance between; the end of the plunger an in the drawing, then, when the magnet 23 is energized, the plunger would be permitted to travel only half of the distance, and, consequently, the arm 20 would only move over half of the contacts 22. Thus the maximum speed at which the motor would be caused the plug is just half the distance shown resistance.

- tive to said plug Having thus. described my invention what I claim as new and desire to secure by Letters Patent, is:

1. In a speed controller for electric motors, in combination, a controlling element, an automatically operated member for actuating said controlling element and an adjustable connection between said. member and said element for varying the range of movement of said element to cause the motor to operate at different predetermined speeds.

2. In a speed controller'for electric motors, in combination, a controlling element, an electromagnetically operated member for actuating said element and an adjustable connection between said member and said element for varying the range of movement of said element to cause the motor to operate at different predetermined speeds. V

3. In a speed controller for electric motors, in combination, a controlling element, an electromagnetic winding, a movable plunger within saidwinding and connected to said element, and a stationary plug within said winding for limiting-the movement of said plunger, said plun er being adjustable relaibr varying the range of movement of said controlling element to cause themotor to operate at different predetermined speeds.

4. In a speed controller for electric motors, in combination, a controlling element, an electromagnetic winding, a plunger mounted within said winding, a stationary plug within said winding for limiting the movement of said plunger and an adjustable connection between said plunger and said controlling element whereby said plunger may be adjusted to vary the range of movement of said controlling element to cause the motor to operate at difierent predetermined speeds.

5,. In a speed controller for electric motors,

'in combination, a controlling element, movable over a series of contacts, an electromagnetic winding, a plunger within said winding, the end of said plunger being hollow and internally screw-threaded, a tail rod connected to said controlling element and having a screw-threaded portion fitting within the internally screw threaded portion of said plunger, and a lock-nut for pre U0 SKICI Ball I'UG. D116 SUI'BW uu'eaueu 00111166- tion affording means whereby said element may be brought to rest inengagement with different contacts upon the energization of said winding.

6. In a speed controller for electric motors,-

in combination, a controlling element, an

electromagnetic winding, a plunger mounted means for reducing the flow of current through said winding when said element has reached the limit of its movement.

7 g In a speed controller forelectric motors, in combination, a controlling element, an

electromagnetic winding, a plunger mounted within said winding and connected to said element, a stationary plug within said winding for limiting the movement of said plunger, said plunger being adjustable relative to said plug for varying the range of movement of said controlling element, a resistance connected in circuit with said wind ing, a switch tending to short-circuit said resistance, and a pin movably mounted within said plug, and adapted to be actuated by said plunger, upon reaching its final position, to open saidswitch. L

8. In a speed controller for electric motors, in combination, a controlling element, an electromagnetic winding, a plunger within said winding, the end of said plunger being hollow and internally screw-threaded, a tail rod connected to said controlling element and having a screw-threaded portion fitting within the internally screw-threaded portion of said plunger, a lock-nut for preventing movement of saidplunger relative to" said tail rod, and means for reducing the flow of current through said winding when said controlling element has reached th limit of its movement.

9. In an automatic speed controller for electric motors, in combination, a speed controlllng member, a solenoid for operating the same and means for varying the limit of movement of said member and insuring the sealing of the plunger of said solenoid with the stationary core of the solenoid without adjusting the core. i

In witness whereof, I have hereunto subscribed my name in the presence of two witnesses.

ALBERT J. HORTON.

Witnesses:

WILLIAM L. CULLY, CHARLES B. BAKER. 

